upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 49

• Manufacturer Part Number: upd70f3017ay
• Description: V850/sa1tm 32-/16-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

(7) P60 to P65 (Port 6) ··· 3-state I/O
(8) P70 to P77 (Port 7), P80 to P83 (Port 8) ··· input
P60 to P65 constitute a 6-bit I/O port that can be set to input or output in 1-bit units.
P60 to P65 can also function as an address bus (A16 to A21) when memory is expanded externally. When the
port 6 is accessed in 8-bit units, the higher 2 bits of port 6 are ignored when they are written to and 00 is read
when they are read.
The I/O signal level uses the bus interface power supply pins BV
(a) Port function
(b) Alternate functions (External expansion function)
P70 to P77 constitute an 8-bit input-only port in which all the pins are fixed to input mode. P80 to P83 constitute a
4-bit input-only port in which all the pins are fixed to input.
P70 to P77 and P80 to P83 can also function as analog input pins for the A/D converter.
(a) Port function
(b) Alternate functions
P60 to P65 can be set to input or output in 1-bit units using the port 6 mode register (PM6).
P60 to P65 can be set as A16 to A21 using the memory expansion mode register (MM).
(i)
P70 to P77 and P80 to P83 are input-only pins.
P70 to P77 also function as ANI0 to ANI7 and P80 to P83 also function as ANI8 to ANI11, but these alternate
functions are not switchable.
(i)
A16 to A21 (Address 16 to 21) ··· output
These comprise an address bus that is used for external access. These pins operate as the higher 6-bit
address output pins within a 22-bit address. The output changes in synchronization with the rising edge
of the clock in the T1 state of the bus cycle. When the timing sets the bus cycle to inactive, the previous
bus cycle’s address is retained.
ANI0 to ANI11 (Analog input 0 to 11) ··· input
These are analog input pins for the A/D converter.
Connect a capacitor between these pins and AV
not apply voltage that is outside the range for AV
the A/D converter. If it is possible for noise above the AV
these pins using a diode that has a small V
CHAPTER 2 PIN FUNCTIONS
User’s Manual U12768EJ4V1UD
F
value.
SS
SS
and AV
to prevent noise-related operation faults. Also, do
DD
and BV
REF
REF
range or below the AV
to pins that are being used as inputs for
SS
as reference.
SS
to enter, clamp
49